Radio base station apparatus, computer-executable program recorded on a computer-readable medium and a method of setting a connection between a radio base station apparatus and one radio terminal

Abstract

A radio base station apparatus which sets a connection in respect to one radio terminal of a plurality of radio terminals each having a first identifier which is assigned in response to a connection setting request from the one radio terminal. The radio base station apparatus comprises a storage unit configured to store a table associating the first identifier with a second identifier temporarily assigned to at least the one radio terminal, and a connection control unit configured to determine whether or not the second identifier corresponding to the first identifier notified by the one radio terminal remains in the table without being released in response to the connection setting request and to control the connection in accordance with a determination result.

What is claimed is:  
     
         1 . A radio base station apparatus setting a connection in respect to one radio terminal of a plurality of radio terminals each having a first identifier which is assigned in response to a connection setting request from the one radio terminal, 
 the radio base station apparatus comprising: 
 a storage unit configured to store a table associating the first identifier with a second identifier temporarily assigned to at least the one radio terminal; and  
 a connection control unit configured to determine whether or not the second identifier corresponding to the first identifier notified by the one radio terminal remains in the table without being released in response to the connection setting request and to control the connection in accordance with a determination result.  
   
     
     
         2 . The radio base station apparatus according to  claim 1 , wherein the connection control unit sets the connection using the second identifier corresponding to the first identifier notified, if said second identifier corresponding to the first identifier notified remains in the table without being released.  
     
     
         3 . The radio base station apparatus according to  claim 1 , wherein the connection control unit temporarily assigns a new second identifier to the one radio terminal to set the connection using the new second identifier, if the second identifier corresponding to the first identifier notified is absent in the table.  
     
     
         4 . The radio base station apparatus according to  claim 1 , wherein the connection control unit temporarily assigns a new second identifier to the one radio terminal in response to the connection setting request to set the connection using the new second identifier, and the connection control unit releases the second identifier and updates the table using the new second identifier, if the second identifier corresponding to the first identifier notified remains in the table without being released.  
     
     
         5 . The radio station apparatus according to  claim 1 , wherein the connection control unit temporarily assigns a new second identifier to the one radio terminal in response to the connection setting request to set the connection using the new second identifier, and updates the table using the new second identifier, if the second identifier is absent in the table.  
     
     
         6 . The radio station apparatus according to  claim 1 , wherein the connection control unit notifies the one radio terminal in response to the connection setting request of inhibiting a newly setting of a connection related to the connection setting request in response to the connection setting request, if the second identifier corresponding to the first identifier notified remains in the table without being released.  
     
     
         7 . The radio station apparatus according to  claim 1 , wherein the connection control unit temporarily assigns a new second identifier to the one radio terminal to set the connection using the new second identifier in response to the connection setting request, if the second identifier corresponding to the first identifier notified is absent in the table.  
     
     
         8 . The radio station apparatus according to  claim 1 , wherein if the connection control unit fails to receive a first request message, which is cyclically sent from the one radio terminal, the connection control unit sends a second request message to request sending of the first request message to the one radio terminal, and if the connection control unit fails to receive a response to the second request message from the one radio terminal within a predetermined time period after the second request message is sent, the connection control unit releases the connection with respect to the one radio terminal.  
     
     
         9 . The radio base station apparatus according to  claim 1 , wherein the first identifier is a MAC address which is used as a destination address of an Ethernet and fixedly assigned to the plurality of radio terminals.  
     
     
         10 . A computer-executable program recorded on a computer-readable medium for setting a connection between a radio base station apparatus and one radio terminal of a plurality of radio terminals each having a first identifier which is assigned in response to a connection setting request from the one radio terminal, 
 the program comprising: 
 means for instructing a computer to store a table in a storage unit, the table associating the first identifier with a second identifier temporarily assigned to at least the one radio terminal; and  
 means for instructing the computer to determine whether or not the second identifier corresponding to the first identifier notified by the one radio terminal remains in the table without being released in response to the connection setting request and to control the connection in accordance with a determination result.  
   
     
     
         11 . The program according to  claim 10 , wherein the means for instructing the computer to determine includes means for instructing the computer to set the connection using the second identifier corresponding to the first identifier notified, if said second identifier corresponding to the first identifier notified remains in the table without being released.  
     
     
         12 . The program according to  claim 10 , wherein the means for instructing the computer to determine includes means for instructing the computer to temporarily assign a new second identifier to the one radio terminal to set the connection using the new second identifier, if the second identifier corresponding to the first identifier notified is absent in the table.  
     
     
         13 . The program according to  claim 10 , wherein the means for instructing the computer to determine includes means for instructing the computer to temporarily assign a new second identifier to the one radio terminal in response to the connection setting request to set the connection using the new second identifier, and means for instructing the computer to release the second identifier and updates the table using the new second identifier, if the second identifier corresponding to the first identifier notified remains in the table without being released.  
     
     
         14 . The program according to  claim 9 , wherein the means for instructing the computer to determine includes means for instructing the computer to temporarily assign a new second identifier to the one radio terminal in response to the connection setting request to set the connection using the new second identifier, and means for instructing the computer to update the table using the new second identifier, if the second identifier is absent in the table.  
     
     
         15 . The program according to  claim 10 , wherein the means for instructing the computer to determine includes means for instructing the computer to notify the one radio terminal of inhibiting a newly setting of a connection related to the connection setting request in response to the connection setting request, if the second identifier corresponding to the first identifier notified remains in the table without being released.  
     
     
         16 . The program according to  claim 10 , wherein the means for instructing the computer to determine includes means for instructing the computer to temporarily assign a new second identifier to the one radio terminal to set the connection using the new second identifier in response to the connection setting request, if the second identifier corresponding to the first identifier notified is absent in the table.  
     
     
         17 . The program according to  claim 10 , wherein the means for instructing the computer to determine includes means for instructing the computer to send a second request message to request sending of a first request message, which is cyclically sent from the one radio terminal, to the one radio terminal, if the radio base station apparatus fails to receive the first request message, and means for instructing the computer to release the connection between the radio base station apparatus and the one radio terminal, if the radio base station apparatus fails to receive a response to the second request message from the one radio terminal within a predetermined time period after the second request message is sent.  
     
     
         18 . The program according to  claim 10 , wherein the first identifier is a MAC address which is used as a destination address of an Ethernet and fixedly assigned to the plurality of radio terminals.  
     
     
         19 . A method of setting a connection between a radio base station apparatus and one radio terminal of a plurality of radio terminals each having a first identifier which is assigned in response to a connection setting request from the one radio terminal, 
 the method comprising: 
 storing a table in a storage unit, the table associating the first identifier with a second identifier temporarily assigned to at least the one radio terminal;  
 determining whether or not the second identifier corresponding to the first identifier notified by the one radio terminal remains in the table without being released in response to the connection setting request; and  
 controlling the connection in accordance with a determination result.  
   
     
     
         20 . The method according to  claim 19 , wherein the determining includes temporarily assigns a new second identifier to the one radio terminal to set the connection using the new second identifier, if the second identifier corresponding to the first identifier notified is absent in the table.